One Setup and Config to Rule Them All...

AND IN THE DARKNESS BIND THEM!

* Moves src/ to proteus/
  +  This is to be consistent with Python package naming conventions.
  + And to make things like `pip install -e .` work correctly.
  + fixed doc configs required for renaming proteus/src -> proteus/proteus
  + install C header files needed for extension models
* Unified config.py
* Removed old configure shims
Better support for extension modules + development

Add: make develop command
Add: proteus.util.get_include()
Merge remote-tracking branch 'origin/master' into ahmadia/refactor_setup
Add proteus dependency to development builds
Install proteus_blas.h and proteus_lapack.h
Friendlier Makefile, some refactors
fixed broken 'doc' target, doc/Doxyfile relies  on PROTEUS

We can remove the PROTEUS environment variable dependency when we refactor the docs
Merge pull request #101 from erdc-cm/ahmadia/refactor_setup

[Ready for Testing] Refactor setup